| Badland River Limited | Information & communication | 2010 |
| Badminton House (Clifton) Management Company Limited | Households | 2020 |
| Badyal Property UK Limited | Real estate | 2022 |
| Baee Boulevard Ltd | Other services | 2025 |
| Bafung UK 1 Ltd | Health & social care | 2025 |
| Bagade Global Travels Ltd | Professional & scientific | 2025 |
| Bagi B Convenience Store Limited | Wholesale & retail | 2025 |
| Bagi Constructions Limited | Construction | 2023 |
| Bagi Developers Ltd | Construction | 2023 |
| Bags E2 Ltd | Hospitality | 2019 |
| BAH Media Film Production Limited | Information & communication | 2016 |
| Bahia Stores Ltd | Hospitality | 2019 |
| Bahuzo Limited | Administrative & support | 2018 |
| Baileys Specialist Cleaning & Restoration Services Limited | Administrative & support | 2012 |
| Bains Local Limited | Wholesale & retail | 2012 |
| Baire Holdings Ltd | Financial services | 2024 |
| Baith Properties Ltd | Real estate | 2025 |
| Baithak Distribution Limited | Manufacturing | 2025 |
| Bajaj Solutions Limited | Education | 2022 |
| Bajela & Sons Investment Group Ltd | Real estate | 2022 |
| Bajomo Limited | Real estate | 2025 |
| Bakalov Gardening Ltd | Administrative & support | 2026 |
| Bakan Restaurant Ltd | Hospitality | 2026 |
| Bakare Property Ltd | Real estate | 2023 |
| Bake Well Being C.I.C. | Education | 2025 |
| Baker Street of Croydon Ltd | Manufacturing | 2026 |
| Bakersgate Gardens Management Company (Pirbright) Limited | Households | 2004 |
| Bakery Close Freehold Limited | Households | 2002 |
| Bakhtar International Academy Ltd | Professional & scientific | 2026 |
| Bakici Foods Ltd | Hospitality | 2024 |
| Bakrania Media Limited | Professional & scientific | 2016 |
| Baky Ltd | Wholesale & retail | 2025 |
| Bala Bush Ltd | Real estate | 2025 |
| Balaam Wood Management Company Limited | Households | 2014 |
| Balaji Support Care Limited | Health & social care | 2019 |
| Balaji Trading London Limited | Real estate | 2017 |
| Balance Consultants Ltd | Professional & scientific | 2023 |
| Balance FA Limited | Wholesale & retail | 2018 |
| Balanced Construction Ltd | Construction | 2017 |
| Balbarg Limited | Wholesale & retail | 2019 |
| Baldur Construction Ltd | Construction | 2017 |
| Balduzzi Traders Ltd | Administrative & support | 2018 |
| Baleinz Limited | Wholesale & retail | 2021 |
| Balfour Villas Management Company Limited | Households | 2016 |
| Ball Don'T LIE Ltd | Administrative & support | 2025 |
| Balladlyn Limited | Households | 1987 |
| Ballard Investment Company Limited | Financial services | 2008 |
| Balloon Court Management Limited | Households | 2007 |
| Balmain Court Limited | Households | 2007 |
| Balmoral Express Limited | Wholesale & retail | 2025 |
| Balsha Ltd | Real estate | 2021 |
| Balshanth Limited | Real estate | 2023 |
| Balshaw Lane Management Company Limited | Households | 2003 |
| Balston House Management Company Limited | Households | 2022 |
| Baltulyte Property Limited | Real estate | 2021 |
| BAM PR Ltd | Professional & scientific | 2026 |
| BAM Professional Cleaning Ltd | Administrative & support | 2025 |
| Bambinos Day Nursery Limited | Education | 2009 |
| Bamboo Panda Health Limited | Health & social care | 2019 |
| Bamboo Recordings Ltd | Information & communication | 2018 |
| Bamiyan Homes Ltd | Real estate | 2025 |
| Bana Membres Bolingo Ltd | Wholesale & retail | 2021 |
| Banana White Ltd | Administrative & support | 2014 |
| Banbury Lane (King Sutton) Management Company Limited | Households | 2013 |
| Bandera London Limited | Construction | 2023 |
| Bandham Ltd | Health & social care | 2026 |
| Baneasa Ltd | Transport & logistics | 2016 |
| Banehall Limited | Real estate | 2001 |
| Baner Group Ltd | Professional & scientific | 2020 |
| Bangash Commerce Ltd | Wholesale & retail | 2026 |
| Bangla Properties Limited | Real estate | 2018 |
| Banh MI Vietnam Limited | Hospitality | 2023 |
| Bank Place (Wilmslow) Management Limited | Households | 2005 |
| Banks END Management Company Limited | Households | 2013 |
| Banontee Property Ltd | Real estate | 2019 |
| Bansidhar Builders Ltd | Construction | 2025 |
| Bantam Fire Limited | Real estate | 2010 |
| Bantock Court Management Limited | Households | 1983 |
| Banyal Limited | Real estate | 2015 |
| Banyan Estates Ltd | Real estate | 2019 |
| Bar 21 Ilford Limited | Hospitality | 2019 |
| Bar Borough Calisthenics Ltd | Arts & recreation | 2024 |
| Bar-One Services Ltd. | Construction | 2016 |
| Baradan Technology Consulting Ltd | Information & communication | 2019 |
| Barai Heating Ltd | Households | 2018 |
| Baraka Construction Ltd | Construction | 2021 |
| Barakah Quran Academy Ltd | Education | 2023 |
| Baralan International Limited | Administrative & support | 1983 |
| Baran Kebab Ltd | Real estate | 2013 |
| Baransalih Ltd | Hospitality | 2022 |
| Barbarian Entertainment Limited | Wholesale & retail | 2020 |
| Barber Krish Ltd | Other services | 2021 |
| Barboterapia UK Ltd | Other services | 2020 |
| Barbourne Community Stores Limited | Wholesale & retail | 2017 |
| Bardeen Place Management Co. Limited | Households | 2003 |
| Barden Croft (Tonbridge) Residents Management Company Limited | Households | 2023 |
| Bardfield Walk (Great Bardfield) Management Company Limited | Households | 2018 |
| Bardon Lodge Ltd | Households | 2013 |
| Bare Goodness Limited | Manufacturing | 2018 |
| Baremetal DEV Ltd | Information & communication | 2020 |